Locomotive-boiler furnace



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' J. MILTON.

LoGoMoIIvBvBoILEB; PURNAGE. v y No. 503,155; Patented Aug'. 15.1893.

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Patented Aug. 15, 1893.

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' proved means for protecting the air pipes UNITED STATES EEICE.

PATENT LOCOMOTIVE-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No. 503,155, dated August15, 1893.

Applicationiiled January 4, 1898.

.To all whom it may concern:

Be it known that I, JOHN MILTON, of Alexandria, in the county ofAlexandria and State of Virginia, have invented a new and usefulImprovement in Locomotive-Boiler Furnaces, of which the following is aspecification.

My invention is in the nature of certain irnprovements upon theconstruction of boiler furnaces shown in several previous applicationsfor patents made by me, in all of which, as the leading feature, air isintroduced into the lire box through a system of perforated pipesdisposed in inclined position as a partition just above the fire, andprotected from injurious burning by-subjacent water beds, or by jacketsof refractory material.

My present invention comprises an imwithout interfering with the accessto the boiler tubes; and in an improved means for automaticallysupplying air under pressure to the air pipes both while the locomotiveis in progress and standing still, all as hereinafter fully described.

Figure l is a vertical longitudinal section of a locomotive boilerfurnace. Fig. 2 is a horizontal section of the same through the ire box.Fig. 3 is a cross sectional detail of the fire brick protection for theair pipes. Fig. 4 is an enlarged sectional detail of the air feedingdevice.

In the drawings A represents a series of inclined water pipes disposedin the fire box just above the fire with their ends next to the doorhigher than the opposite ends. The higher ends of these pipes areconnected together, and at B, Fig. l, communicate with the water legs atthe sides of the re box, and at their lower ends communicate with thewater leg at the back of the fire box through a blow off valvehereinafter described. These water pipes are intended to have acontinuous circulation of water through them to keep them cool andprevent burning, and for the purpose also of increasing the generationof steam. These Water pipes form a support for the air pipes I, whichare housed between two layers of lire brick G and H. These two layers ofbrick have grooves formed in their adjacent faces t0 receive theperforated air pipes, each of which pipes has a row of perforations oneach side. Both layers of fire Serial No. 457,295. (No model.)

brick have vertical openings c through them, up through which pass aportion of the fire currents, the balance and greater portion of the hotgases passing up between the rows and outside of the iire bricks. Theair issuing from the air pipes passes up through the perforations uponone side, and commingle with and completely consume the smoke and gasesarising between the rows of lire bricks and outside of the same, andupon the opposite or inner sides of the air pipes the air is directedinto the gases arising through the openings c, and for this purpose thelire bricks have formed on their inner faces tapering depressionsd thatlead the air from the pipes into the openings c. To facilitatedislodging ashes from the top of the fire bricks their upper sides arebeveled each way from the middle line, and the lower layers of brickhave shoulders c e that lie between the water pipes and prevent themfrom being displaced laterally. These bricks are simply laid `upon thewater pipe, and are conveniently and quickly detachable, so as to permitaccess to the tubes of the boiler for inspecting and repairing the same.These fire bricks are easily replaced in part or whole when broken orworn out, and they afford a protection to the air pipe against theintense heat within the fire box,and also serve to de- Iiect the air inthin sheets through every part of the rising smoke and gases toperfectly consume the same.

The air tubes I which supply the iire box receive air through crosspipes .I from pipes L terminating at their front ends in funnelsconveniently placed in the front part of the .locomotive and adapted tocreate a forced air pipe L, having in its bottom an opening oand anupwardly bent lip c just in front of said opening.

M is a valve adapted to the cross section of IOO the casing P and havinga lip 'u at its outer tension on the opposite side of its fulcrum thatis connected by a link with a lever arm 'n on the end of the axis ofabutterfly valve m in a steam pipe N. This steam pipe runs from theboiler and terminates in anozzle within the casing P behind the valve M.The outer' end of the lever arm n is provided with a counterweight rwhich slightly overbalances the weight of valve M and holds it shut andbuttertiy valve m open. The action of these parts is as follows: Whenthe locomotive is in motion the air driven in the funnels K forces downthe valve M, throwing it wide Y open, closing with lip o, the orifice O,and lifting the arm n, and closing the steam valve. Air is now beingsupplied in a forced feed to the funnel by the movement of thelocomotive. When the locomotive stops, the air pressure on valve M beingremoved, counterweight fr drops down and closes valve M; opens air inletO, and also opens the steam valve m. Steam now flows through nozzle W,and sucking air in at O, supplies a forced feed of air just so long asthe locomotive is stationary. When the locomotive starts again, theimpact of air on valve M opens it again, the steam supply is cut o, andair is fed by the mere passage of the locomotive again. In this way thedevice is made to work automatically, the forced air feed beingcontinuously maintained in a perfectly automatic manner, no matterwhether the locomotive is moving or stationary.

In case there is too strong a draft in the pipe L, as might occur with ahead wind, a relief valve s, or escape damper, may be provided to allowthe escape of any desired portion of the blast.

As a modification of my invention, instead of using steam from pipe N, Imay connect this pipe N to the air reservoir that supplies the brakes,and allow a blast of air to proceed directly therefrom without theinduction of air by the steam jet.

It will be understood that although described as applicable tolocomotive boiler furnaces, the several features of my invention are notlimited thereto, but may be applied to marine orother forms of boilers.

I-Iaving thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination in a steam boiler furnace, of a set of water pipesarranged in the fire box above the fire and having communication at bothends with the water space of the boiler, two layers of detachable lirebrick having cavities in their adjacent faces and supported upon thewater pipes, and a set of perforated air pipes arranged between the twolayers of fire brick substantially as shown and described.

2. The combination in a furnace, of the supporting water pipes A, thetwo layers of tire brick H G having central opening c and seats orrecesses for the air pipes upon each side of said opening, and the airpipes I perforated on each side, and arranged between the layers of rebrick on each side of the opening substantially as shown and described.

3. The combination in a furnace, of the supporting water pipes A, thetwo layers of lire brick lfI G having central opening c, shoulders e,and cavities or recesses in their adjacent faces, and the perforated airpipes I arranged between the fire brick on each side of the centralopening, substantially as shown and described.

4. The combination with a locomotive furnace; of an air feeding deviceconsisting of funnels and pipes arranged to create a forced draft by themotion of the locomotive, and a compound air and steam injector valvearranged in the pipe that leads the air to the fui-nace, the said airand steam valve being connected together and arranged to automaticallyoperate in an alternate manner,the opening of the air valve from themotion of the locomotive serving to close the steam valve, and the steamvalve being arranged to open and the air valve to close when thelocomotive stands still, substantially as shown and described.

5. The air feeding device consisting of a pipe having a funnel at itsforward end, a casing P with lip c and opening o, the air valve M havinglip fu, the steam pipes N with injector nozzle w and butterfly valve m,and crank arm n, Weight r, and link t connecting the steam valve to theair valve for alternate action, substantially as shown and described.

JOHN MILTON.

Witnesses:

EDWD. W. BYRN, SoLoN C. KEMON.

